linux-kernel - Re: [PATCH V2 2/2] apple_gmux: Add support for newer hardware

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Date:	Wed, 15 Aug 2012 09:46:31 +0200
From:	Bernhard Froemel <froemel@...rs.tuwien.ac.at>
To:	Matthew Garrett <mjg@...hat.com>, linux-kernel@...r.kernel.org,
	platform-driver-x86@...r.kernel.org
Subject: Re: [PATCH V2 2/2] apple_gmux: Add support for newer hardware

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On 08/14/2012 07:11 PM, Bernhard Froemel wrote:
> Need to play around further..
I think I solved the communication problems concerning byte writes to
the gmux device.

This:
http://luna.vmars.tuwien.ac.at/~froemel/rmbp/patch-apple-gmux_v2.txt
works reliable for me (50+ suspend/resume cycles, many brightness
changes) *without* delays.

I looked once more through Apple's original driver and noticed that
their cmd_done waits until bit 1 is set (not cleared!) and also does
the final read from GMUX_PORT_DPM_RADDR only if bit 1 is not set.
Also it seems that in case of byte writes the old interface should be
followed as well (Apple, why?!).

Bernhard

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